Egonex-AI/Understand-Anything · error

Fingerprint patch does not match the incremental plan commit

Error message

Fingerprint patch does not match the incremental plan commits

What it means

finalize-incremental.mjs refuses to run when the fingerprint patch and the incremental plan were computed against different git ranges. The script compares patch.baseCommit/headCommit against plan.baseCommit/headCommit and throws if either differs, because applying a patch from the wrong range would corrupt the fingerprint baseline. It is a safety invariant of the incremental update pipeline.

Source

Thrown at understand-anything-plugin/skills/understand/finalize-incremental.mjs:392

    analyzedAt: new Date().toISOString(),
    gitCommitHash: plan.headCommit,
  };
}

async function main() {
  const args = process.argv.slice(2);
  if (args.length !== 1 || args[0].startsWith('--')) {
    throw new Error('Usage: node finalize-incremental.mjs <projectRoot>');
  }
  const projectRoot = realpathSync(args[0]);
  const uaDir = resolveUaDir(projectRoot);
  const intermediateDir = join(uaDir, 'intermediate');
  const plan = readJson(join(intermediateDir, 'incremental-plan.json'));
  const patch = readJson(join(intermediateDir, 'fingerprint-patch.json'));
  const scan = readJson(join(intermediateDir, 'scan-result.json'), { totalFiles: 0 });
  if (!plan || !patch) throw new Error('Incremental plan or fingerprint patch is missing');
  if (patch.baseCommit !== plan.baseCommit || patch.headCommit !== plan.headCommit) {
    throw new Error('Fingerprint patch does not match the incremental plan commits');
  }

  if (plan.action === 'FULL_UPDATE') {
    throw new Error('FULL_UPDATE must run the full /understand pipeline');
  }
  if (plan.action === 'SKIP' && isGeneratedOnly(plan)) {
    process.stdout.write('Generated artifacts only: analysis baseline unchanged\n');
    return;
  }

  const graphPath = join(uaDir, 'knowledge-graph.json');
  const importMapRefreshPaths = Array.isArray(plan.importMapRefreshPaths)
    ? plan.importMapRefreshPaths
    : [];

  if (plan.action === 'SKIP') {
    const previousGraph = readJson(graphPath);
    if (!previousGraph || !Array.isArray(previousGraph.nodes) || !Array.isArray(previousGraph.edges)) {

View on GitHub (pinned to 07edf82a04)

Solutions

1. Delete .ua/intermediate/incremental-plan.json and fingerprint-patch.json and rerun the incremental planning step so both files are produced from the same commit range
2. Verify git HEAD matches plan.headCommit before finalizing; if commits landed meanwhile, regenerate the plan
3. Avoid running finalize from a different branch or worktree than the one that produced the plan
4. Never reuse intermediate artifacts across runs; clean .ua/intermediate/ before restarting

Example fix

# before (stale mixed artifacts)
node finalize-incremental.mjs .
# Error: Fingerprint patch does not match the incremental plan commits

# after: regenerate both artifacts in one run
git checkout <plan-branch> && rm -rf .ua/intermediate && rerun /understand incremental pipeline

const plan = JSON.parse(fs.readFileSync('.ua/intermediate/incremental-plan.json','utf8'));
const patch = JSON.parse(fs.readFileSync('.ua/intermediate/fingerprint-patch.json','utf8'));
if (patch.baseCommit !== plan.baseCommit || patch.headCommit !== plan.headCommit) {
  throw new Error('Plan/patch commit mismatch; regenerate intermediate artifacts');
}

const commitsMatch = (plan, patch) =>
  !!plan && !!patch &&
  patch.baseCommit === plan.baseCommit &&
  patch.headCommit === plan.headCommit;

try {
  await run('node finalize-incremental.mjs .');
} catch (err) {
  if (String(err.message).includes('does not match the incremental plan commits')) {
    fs.rmSync('.ua/intermediate', { recursive: true, force: true });
    await rerunIncrementalPipeline();
  } else throw err;
}

When it happens

Trigger: Running finalize-incremental.mjs when fingerprint-patch.json was regenerated after a new commit (or on a different branch/rebase) while incremental-plan.json is stale, or vice versa; interleaving two /understand incremental runs; manually copying intermediate files from another run.

Common situations: A rebase or pull changed HEAD after the plan was computed but before finalize; a developer re-runs only the finalize step hours later after commits landed; concurrent Claude sessions share the same .ua/intermediate directory; hand-editing or restoring files from a backup.

Understand the failure class

Background: Checksum mismatch errors: "checksum verification failed", "digest mismatch", "expected vs actual checksum" — what they mean and how to fix them — this error's family across 41 libraries.

Related errors

• FULL_UPDATE must run the full /understand pipeline
• knowledge-graph.json is missing or invalid; baseline not adv
• assembled-graph.json is missing or invalid; baseline not adv
• ${command} failed: ${detail}
• HEAD changed since prepare; baseline not advanced

AI-assisted analysis of Egonex-AI/Understand-Anything@07edf82a04 (2026-09-07). Data as JSON: /api/errors/5edbea41bb085eb4. Report an issue: GitHub.